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libc: Correct time zone copy in strftime()

Time zone are longer than 3 characters some times, and the
code was not checking the pending size in the buffer and
it could drive to buffer overflow problems.

--- a/src/libc/time/strftime.c

+++ b/src/libc/time/strftime.c

@@ -293,8 +293,13 @@

 			inc = timezone(s, n, timeptr);

 			break;

 		case 'Z':

-			memcpy(s, timeptr->tm_zone, 3);

-			inc = 3;

+			inc = strlen(timeptr->tm_zone);

+			if (inc > n) {

+				*s = '?';

+				inc = 1;

+			} else {

+				memcpy(s, timeptr->tm_zone, inc);

+			}

 			break;

 		case '\0':

 			inc = 0;